The duties article was not an afterthought that later readers forgot. It started as line one, then got moved to the roof.
John Peters Humphrey, first director of the UN Human Rights Division, wrote the Secretariat outline in early 1947. UN document E/CN.4/AC.1/3 opens: everyone owes a duty to his State and to the United Nations, and must take a just share of social duties and of the common sacrifices that serve the common good. Johannes Morsink prints that text in The Universal Declaration of Human Rights: Origins, Drafting, and Intent (1999). The outline ran to forty-eight articles. Humphrey said it contained every conceivable right the Commission might want to discuss.
René Cassin recast that list as a Greek temple: preamble as the steps, Articles 1 and 2 as the foundation, four columns of rights, and a pediment — the triangular roof — of duties and international order, which became Articles 28–30. Mary Ann Glendon maps the committee in A World Made New (2001). Cassin knew the columns needed a roof. He did not lead with the roof.
P.C. Chang, the Chinese vice-chair, put "conscience" into Article 1 as a rendering of Confucian 仁 and added "in a spirit of brotherhood." He did not want what he called selfish individualism. Charles Malik, the Lebanese rapporteur, wanted "endowed by nature with reason" — Thomist natural-law language. In the Third Committee in October 1948 the words "by nature" came out, after Brazil floated a reference to God and Chang blocked a theistic clause (A/C.3/SR.96, 7 October 1948). Malik later said "endowed" still meant "by nature."
So the audit's complaint that Article 29 sits unused is a 1947–48 architectural choice, not a 1990s activist invention. The committee put the load-bearing piece last.